Final answer:
John Proctor discredits 'her' in 'The Crucible' by exposing Abigail's deceitful actions and motivations. He also tries to discredit his wife, Elizabeth, in order to save her from being accused of witchcraft.
Step-by-step explanation:
John Proctor discredits 'her' in the play 'The Crucible' by Arthur Miller. The 'her' referred to in the question is most likely referring to either Abigail Williams or Elizabeth Proctor. In the play, John exposes Abigail's deceitful actions and motivations, revealing her affair with him and her manipulation of the witchcraft trials to get revenge on Elizabeth. By doing so, John discredits Abigail and exposes her true character to others.
As for Elizabeth Proctor, John's wife, he tries to discredit her in order to save her from being accused of witchcraft. John confesses to the affair with Abigail, revealing Elizabeth's lie about it in court. He believes that if Elizabeth is seen as an untrustworthy witness, her life will be spared. This attempt to discredit Elizabeth ultimately leads to John's downfall as he is accused of witchcraft himself.